This Matco Tools 16-piece set includes 1/4 inch drive twist sockets ranging from 8.25mm to 12.0mm, with 0.25mm increments. The sockets are designed for use with twist wrenches and are made to fit various sizes of nuts and bolts. The set comes complete with a storage tray for easy organization and transport. The brand of the sockets is Matco Tools, a well-known manufacturer of high-quality tools. The sockets are a set, rather than a single item, and the set includes 16 sockets. The manufacturer part number is TSM16. The sockets are suitable for use in the automotive industry and are categorized as sockets and socket sets.